Differentiating between juvenile gulls of the same species is difficult enough. The problem is compounded with Herring Gulls and Ring-Billed Gulls, however, because their juveniles can resemble each other.

I went with the 3rd Winter Herring Gull on this one because of the brownish on the tips of the wings (folded back above the rump). The winter Ring-Billed Gulls have darker wing tips, and the 1st and 2nd Winter Herring Gulls are more uniformly brown.

Photo taken with the Canon Digital Rebel XT / 350D and a Sigma 70-300mm Lens on February 9, 2008 at Leach Park in Bettendorf, Iowa.